Description (CNA)
MyBB is free and open source forum software. Prior to 1.8.40, the built-in CAPTCHA does not consistently enforce single-use semantics, allowing remote attackers to bypass CAPTCHA controls through challenge replay. The successful validation paths in contact.php, member.php?action=do_resendactivation, member.php?action=do_lostpw, member.php?action=do_emailuser, and sendthread.php?action=do_sendtofriend do not call captcha::invalidate_captcha() for the MyBB Default CAPTCHA selected by the captchaimage setting. A valid response can therefore be reused until a non-vulnerable endpoint invalidates it, an incorrect response is submitted, or the challenge expires. This issue is fixed in version 1.8.40.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| mybb / mybb | affected < 1.8.40 |
CWE
CWE-837
References
- https://github.com/mybb/mybb/security/advisories/GHSA-jrrr-f3jw-mjmc
- https://github.com/mybb/mybb/commit/c2ed54f9259b9ce05728a9e657169033fe4adffc
- https://github.com/mybb/mybb/releases/tag/mybb_1840
- https://mybb.com/versions/1.8.40
ADP enrichment
No English description supplied.
No references supplied.